Question1: Regression - What factors predict duration of dyspnea in elders with heart failure?
Note: gender is coded 0 = male, 1 = female [Clue: To answer this question, examine the coefficients table]
|
Descriptive statistics
|
|
|
mean
|
Std. Deviation
|
N
|
|
dysLN
|
4.0562
|
1.84562
|
66
|
|
HFSPSTOT
|
20.32
|
8.64
|
66
|
|
Age
|
76.12
|
7.796
|
66
|
|
gender_dummy
|
0.5
|
0.504
|
66
|
|
Correlations
|
|
|
dysLN
|
HFSPSTOT
|
Age
|
gender dummy
|
|
pearson
|
dysLN
|
1
|
0.304
|
0.034
|
0.22
|
|
|
HFSPSTOT
|
0.304
|
1
|
-0.112
|
-0.037
|
|
|
Age
|
0.034
|
-0.112
|
1
|
-0.341
|
|
|
gender dummy
|
0.22
|
-0.037
|
-0.341
|
1
|
|
Sig(1- tailed)
|
dysLN
|
-
|
0.007
|
0.394
|
0.038
|
|
|
HFSPSTOT
|
0.007
|
-
|
0.185
|
0.384
|
|
|
Age
|
0.394
|
0.185
|
'-
|
0.003
|
|
|
gender dummy
|
0.038
|
0.384
|
0.003
|
'-
|
|
N
|
dysLN
|
66
|
66
|
66
|
66
|
|
|
HFSPSTOT
|
66
|
66
|
66
|
66
|
|
|
Age
|
66
|
66
|
66
|
66
|
|
|
gender dummy
|
66
|
66
|
66
|
66
|
|
Variables Entered/ Removed
|
|
Model
|
variables entered
|
variables removed
|
method
|
|
1
|
Gender_dumy, HFSPSTOT, Age
|
-
|
Enter
|
- All requested variables entered
- Dependent variable : dysLN
|
Model summary
|
|
Model summary
|
R
|
R square
|
Adjusted R square
|
Std error of the estimate
|
|
1
|
0.414a
|
0.171
|
0.131
|
1.72052
|
1. Predictors: ( constant), gender_dummy, HFSPSTOT, age
|
ANOVA b
|
|
Model
|
Sum of squares
|
df
|
mean square
|
F
|
Sig
|
|
regression
|
37.878
|
3
|
12.626
|
4.265
|
0.008 a
|
|
residual
|
183.531
|
62
|
2.96
|
|
|
|
total
|
221.409
|
65
|
|
|
|
1. Predictors: ( constant), gender_dummy, HFSPSTOT, age
2. Dependent variable : dysLN
|
Coefficients
|
|
Model
|
unstandardized coefficients
|
standardized coefficients
|
t
|
sig
|
|
|
B
|
Std.Error
|
Beta
|
|
|
|
( constant)
|
0.987
|
2.454
|
|
-0.402
|
0.689
|
|
HFSPSTOT
|
0.071
|
0.025
|
0.334
|
2.86
|
0.006
|
|
Age
|
0.04
|
0.029
|
0.17
|
1.37
|
0.176
|
|
gender dummy
|
1.063
|
0.452
|
0.29
|
2.352
|
0.022
|
1. Dependent variable : dysLN
|
Statistics
|
|
|
|
HFSPSTOT
|
Dyspdur
|
|
|
valid
|
77
|
68
|
|
|
missing
|
0
|
9
|
|
mean
|
|
19.57
|
194.6793
|
|
median
|
|
19
|
72
|
|
mode
|
|
24
|
336
|
|
std. Deviation
|
|
8.469
|
359.6012
|
Question2: What percent variance in dyspnea duration is explained by this model? (Hint: To answer this question, examine the model summary table) dyspnea in elders with heart failure?